61763881 has 9 divisors (see below), whose sum is σ = 64204023. Its totient is φ = 59414040.

The previous prime is 61763857. The next prime is 61763887. The reversal of 61763881 is 18836716.

The square root of 61763881 is 7859.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 32387481 + 29376400 = 5691^2 + 5420^2 .

It is not a de Polignac number, because 61763881 - 2⁹ = 61763369 is a prime.

It is a super-2 number, since 2×61763881² = 7629553992364322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61763887) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 227776 + ... + 228046.

Almost surely, 2^61763881 is an apocalyptic number.

61763881 is the 7859-th square number.

61763881 is the 3930-th centered octagonal number.

It is an amenable number.

61763881 is a deficient number, since it is larger than the sum of its proper divisors (2440142).

61763881 is an frugal number, since it uses more digits than its factorization.

61763881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 600 (or 300 counting only the distinct ones).

The product of its digits is 48384, while the sum is 40.

The cubic root of 61763881 is about 395.2860844759.

The spelling of 61763881 in words is "sixty-one million, seven hundred sixty-three thousand, eight hundred eighty-one".